Beating non-linearities: improving the Baryon Acoustic Oscillations with the linear point

Abstract

We propose a new way of looking at the Baryon Acoustic Oscillations in the Large Scale Structure clustering correlation function. We identify a scale s_LP that has two fundamental features: its position is insensitive to non-linear gravity, redshift space distortions, and scale-dependent bias at the 0.5% level; it is geometrical, i.e. independent of the power spectrum of the primordial density fluctuation parameters. These two properties together make s_LP, called the "linear point", an excellent cosmological standard ruler. The linear point is also appealing because it is easily identified irrespectively of how non-linearities distort the correlation function. Finally, the correlation function amplitude at s_LP is similarly insensitive to non-linear corrections to within a few percent. Hence, exploiting the particular Baryon features in the correlation function, we propose three new estimators for growth measurements. A preliminary analysis of s_LP in current data is encouraging.

10 pages, 9 figures. Added discussion on the correlation function inflection point. This version matches the published MNRAS paper

References in corpus (12)

• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Nonlinear Evolution of Baryon Acoustic Oscillations
• On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of Matter
• Equivalence Principle and the Baryon Acoustic Peak
• The detectability of baryonic acoustic oscillations in future galaxy surveys
• A Lagrangian effective field theory
• A Closure Theory for Non-linear Evolution of Cosmological Power Spectra
• `Eppur Si Muove': On The Motion of the Acoustic Peak in the Correlation Function
• Modeling scale-dependent bias on the baryonic acoustic scale with the statistics of peaks of Gaussian random fields
• Reconstruction within the Zeldovich approximation
• Large-Scale Structure in Brane-Induced Gravity I. Perturbation Theory
• Accuracy of cosmological parameters using the baryon acoustic scale

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